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Hi there, if the car was originally fitted with alloys, and these bolts came with the car, then they will be suitable for alloy wheels (you are correct with pointing out a difference between alloy/non-alloy nuts & bolts).
However - If you have any doubts regarding their suitability, then I would replace with new - you have the ability to visually assess their condition, whereas I don't.
Again, regarding the discs, I would believe that since alloy wheel bolts tend to be made from 'softer' steel than the discs, then you should be fine - seeing how the new bolts thread in & tighten would indicate their condition.
Remember that the wheel bolts & nuts (where applicable) should be re-torqued after 100 miles of driving since they have been refitted.
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater